Year	Percent
1968-01-01	0.0583333328329559
1969-01-01	4.0226534522570700
1970-01-01	2.8102481985703300
1971-01-01	3.8782026319753400
1972-01-01	6.1548841741127100
1973-01-01	11.2853107346839000
1974-01-01	16.6010915093494000
1975-01-01	31.6534233153685000
1976-01-01	1.0830921871066100
1977-01-01	11.3405856371038000
1978-01-01	3.4196510558751600
1979-01-01	9.6533598525703100
1980-01-01	8.7290276607232900
1981-01-01	5.9131937203162600
1982-01-01	17.3763852168922000
1983-01-01	11.6169845681475000
1984-01-01	11.7840274796329000
1985-01-01	13.0000576159794000
1986-01-01	6.1847785445693200
1987-01-01	-4.1407237863380600
1988-01-01	-1.8266822507929800
1989-01-01	0.4473093407713500
1990-01-01	0.3250986301832240
1991-01-01	-1.7535569019930800
1992-01-01	-0.1099429670856570
1993-01-01	-0.5864346151201870
1994-01-01	32.2936668569551000
1995-01-01	7.8640078457011300
1996-01-01	2.7543066348240500
1997-01-01	1.7531647809723700
1998-01-01	1.1567807039134300
1999-01-01	0.8272506082724680
2000-01-01	0.7319819819815980
2001-01-01	2.9745008391957200
2002-01-01	2.3373018745429800
2003-01-01	-0.0519970242714233
2004-01-01	0.5147817810229740
2005-01-01	1.7113332585550500
2006-01-01	2.1122858387711200
2007-01-01	5.8533042846768400
2008-01-01	7.3472023657840900
2009-01-01	-2.2480214785533900
2010-01-01	1.2286811967334400
2011-01-01	3.4032282978696700
2012-01-01	1.4182287117784800
2013-01-01	0.7102454866952250
2014-01-01	-1.0902550744689400
2015-01-01	0.1352119336352000
2016-01-01	0.8372849425574320
2017-01-01	1.3181531484778500